Embedding vCard links in welcome emails requires careful consideration of various factors. Marketers suggest strategies such as attaching or linking vCards, with some favoring direct integration of contact details within the email for user convenience. A clear call to action and explanation of benefits can improve adoption. Technical documentation emphasizes proper formatting, MIME type, and UTF-8 encoding for broad compatibility. GDPR compliance is crucial for data handling. Experts warn about potential spam flags and rendering issues in older email clients, necessitating testing and caution. Performance should be tracked through download metrics and alternative contact methods provided for those who don't use vCards. A/B testing can help determine if vCards are the best option for your audience.